With the exception of surgery for localized disease, there is presently a lack of available therapies with proven survival benefit for patients with neuroendocrine tumors (NET). Available treatment options for unresectable disease include the use of somatostatin analogs, which may relieve symptoms related to hormonal hypersecretion. The efficacy of cytotoxic chemotherapy in patients with metastatic carcinoid tumors is also limited. Combinations of either streptozocin and cyclophosphamide, or streptozocin and 5-fluorouracil, appear to be inactive, and both regimens are associated with substantial toxicity.